From: Arnd Bergmann <arnd@arndb.de>
To: linuxppc-dev@ozlabs.org
Cc: Milton Miller <miltonm@bga.com>
Subject: Re: 82xx performance
Date: Thu, 17 Jul 2008 23:32:17 +0200 [thread overview]
Message-ID: <200807172332.18030.arnd@arndb.de> (raw)
In-Reply-To: <DCEAAC0833DD314AB0B58112AD99B93B04B34E18@ismail.innsys.innovsys.com>
On Thursday 17 July 2008, Rune Torgersen wrote:
> Arnd Bergmann wrote:
> > So again, nothing conclusive. I'm running out of ideas.
>
> Is the syscall path different or the same on ppc and powerpc?
> Any differences in the task switching, irq handling or page fault
> handling?
>
It's all different in suble ways, but those changes should only
show up in the system time accounting, not user time accounting.
One change that I would expect to show up in user space performance
is different TLB management, in a way that causes increased flushing
and reloading of page table entries. I don't have the slightest
idea if or in what ways that has changed. Maybe Ben has a clue
about this.
Arnd <><
next prev parent reply other threads:[~2008-07-17 21:32 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-07-14 16:34 82xx performance Rune Torgersen
2008-07-14 20:44 ` Arnd Bergmann
2008-07-15 14:16 ` Rune Torgersen
2008-07-15 18:25 ` Rune Torgersen
2008-07-15 19:50 ` Arnd Bergmann
2008-07-16 21:08 ` Rune Torgersen
2008-07-16 21:45 ` Arnd Bergmann
2008-07-16 21:53 ` Rune Torgersen
2008-07-16 22:32 ` Arnd Bergmann
2008-07-17 15:12 ` Rune Torgersen
2008-07-17 15:47 ` Arnd Bergmann
2008-07-17 15:52 ` Rune Torgersen
2008-07-17 18:24 ` Rune Torgersen
2008-07-17 19:43 ` Arnd Bergmann
2008-07-17 19:54 ` Rune Torgersen
2008-07-17 21:32 ` Arnd Bergmann [this message]
2008-07-25 20:41 ` Rune Torgersen
2008-07-26 3:47 ` Milton Miller
2008-07-15 15:57 ` Milton Miller
2008-07-15 18:12 ` Rune Torgersen
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